Chemical Bonding Questions and Answers

Choose the sentence that is capitalized correctly. my uncle goes West each summer to visit his Sister. My uncle goes west each summer to visit his sister. My uncle goes West each summer to visit his sister.

In the periodic table, what is a period? A period is the horizontal row of elements that share the same amount of electrons in the outermost shell. A period is the vertical row of elements that share the same substance. A period is horizontal columns of the same substance. A period is a column that contains all neutrons

The electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown below. Which of the following symbols represents a chlorine ion with a stable arrangement of eight valence electrons?

A student attempted name the following compound: CF4- They answered that the name was "monocarbon tetrafluoride" but that is not correct. Explain in one sentence why their answer is wrong, and what the right answer is.

Which lists the elements in order from most conductive to least conductive? potassium (K), selenium (Se), germanium (Ge) germanium (Ge), potassium (K), selenium (Se) selenium (Se), germanium (Ge), potassium (K) potassium (K), germanium (Ge), selenium (Se)

Write the balanced chemical equation for the reaction that occurs when aluminum metal is added to liquid bromine to produce aluminum bromide. Phases are not graded. balanced equation: Write the balanced chemical equation for the oxidation of chromium in which chromium metal reacts with oxygen to produce chromium(III) oxide. Phases are not graded. balanced equation:

0.250 mol of NaSO are added to enough water to make 1.0 L of solution. A Ba(NO3)₂ solution is slowly added to this solution. What precipitate will form first? A. BaSO4 B. Na₂SO4 C. K,SO4 D. Na, CrO₂ E. BaCrO4 F. K₂CRO4

The net ionic equation for the aqueous neutralization reaction between acetic acid and sodium hydroxide is different from that for the reaction between hydrochloric acid and sodium hydroxide. Explain by writing balanced net ionic equations. (b) For a solution of acetic acid in water, list the major species in decreasing order of concentration.

Which compound has the strongest hydrogen bonding between its molecules? 1. HBr 2. HCI 3. HF 4. HI

A central atom is found to have one double bond, one single bond, and one non-bonding pair of electrons. What is the hybridization on the central atom? Formatting your answer: While sp4d does not exist, if you wanted to enter it as your answer, you should just type sp4d. Do not use ^

What is the first thing you should do if you want to determine if a molecule is polar or not? Determine its hybridization. Draw the Lewis Structure. Draw the dipole arrows. Search for it on the internet.

Part B What is the net ionic equation of the reaction of MgSO4 with Ba(NO3)2? Express you answer as a chemical equation including phases. A chemical reaction does not occur for this question.

A fellow chemistry student in another class is wondering what half-life is and some of the math behind it. Explain in one paragraph of less the concept of half-life. Include information such as the appearance of a half-life graph, as well as ways to calculate and use half-life. If half-lives and nuclear decay have a real-life application, include that in your answer as well.

How many moles of He are needed to react with 4.8 mol of O₂?

Write the molecular, total ionic, and net ionic equations on a piece of paper before you try to answer this question. Aqueous solutions of sodium sulfite and hydrobromic acid are mixed. 1. Name the initial two products formed using the double displacement method. sodium and acid 3. What is the coefficient in front of hydrobromic acid in the balanced equation? 4. Name the spectator ions in the total ionic equation (one word per blank). (cation) and (anion) 5. Name the products in the net ionic equation: (1) and

Interpret: The melting point and boiling point can be used to measure the strength of intermolecular forces holding the molecules together. Based on the melting and boiling points, which The weakest? I think Explain your conclusions:

Will a solution of LIIO be basic, acidic, or neutral? Select one answer. A. basic B. O acidic C. O neutral 7 points Use Ionization Constants of Common Weak Acids and Ionization Constants of Common Weak Bases as needed.

Draw the Lewis structure of phosphate (PO4³) with minimized formal charges and then determine the hybridization of the central atom.

A hybrid orbital set is shown below. How many unhybridized p orbitals does it have?

Use the MO diagram (below) to calculate the bond order for BO+.

Which of the following molecules has a bond order of 1.5 according to molecular orbital theory? A) B₂ B) N₂ C) CN D) NO

List the following atoms in order of increasing size (atomic radius): Ba, Mg, Sr. A) Sr Ba Mg B) Ba< Sr< Mg C) Mg Sr < Ba < D) Mg < Ba < Sr

Consider the fourth period elements Ca, Mn, Co, Se, and Kr. Which of these atoms are paramagnetic? A) Ca, Mn, Co B) Mn, Co, Kr C) Ca, Kr, Se D) Mn, Co, Se E) Ca, Kr

What does it mean if an element has 8 valence electrons? A. It has 8 protons. B. It reacts vigorously. C. It is in Group 8. D. It has a full octet.

Identify the list in which the atoms are ordered by increasing Zeff for a valence electron calculated by the simple or approximate method? A) P<S<Si<CI B) Si<P<S<CI C) CI<S<P<Si D) S<CI<P<Si E) Si<P<CI<S

Nitrogen dioxide is one of the many oxides of nitrogen (often collectively called "NOX") that are of interest to atmospheric chemistry. It can react with itself to form another form of NOx, dinitrogen tetroxide. A chemical engineer studying this reaction fills a 50 L tank with 14. mol of nitrogen dioxide gas. When the mixture has come to equilibrium he determines that it contains 6.2 mol of nitrogen dioxide gas. The engineer then adds another 3.5 mol of nitrogen dioxide, and allows the mixture to come to equilibrium again. Calculate the moles of dinitrogen tetroxide after equilibrium is reached the second time. Round your answer to 2 significant digits.

Why does Ne have a smaller radius than F? Ne has more mass than F making it larger. The valence electrons in Ne feel a greater Zeff than those in F. F has more protons in its nucleus than Ne. Ne is further to the left on the periodic table than F. Ne has its valence electrons in a higher energy level than F.

Calculate the percent composition by mass of Ca(OH)2. Calculate the molar mass of Ca(OH)2 = g/mol % Ca % O % H

Calculate the empirical formula of a compound of tin (Sn) that contains 78.76 % Sn and 21.24 % O by mass. Use values from the attached Periodic Table. These are the only values that will be counted as correct. Give all values to the hundredths place. Moles of Tin = mol Sn Moles of O = mol O Ratio of mol O/mol Sn = Give to one significant figure. Empirical formula =

Notice that "PO4" appears in two different places in this chemical equation. PO3 is a polyatomic ion called phosphate. What number should be placed in front of Na3PO4 to give the same total number of phosphate ions on each side of the equation? ?Na3PO4 + MgCl2-Mg3 (PO4)2 + NaCl

Platinum forms a compound with chlorine that contains 42.1 % Cl by mass. What is the % Pt? Calculate the moles of Cl = mol Cl Calculate the moles of Pt = mol Pt Determine the empirical formula of the compound,

For each of the following numbers of electrons, give the for- mula of a positive ion that would have that number of electrons, and write the complete electron configuration for each ion. a. 10 electrons b. 2 electrons c. 18 electrons d. 36 electrons

Draw the Lewis structure of acetonitrile (CH3CN) and then choose the appropriate pair of molecular geometries of the two central atoms. Your answer choice is independent of the orientation of your drawn structure. Click to draw a new structure A) tetrahedral / linear B) trigonal planar / bent (120°) C) trigonal/trigonal pyramidal D) planar / tetrahedral E) linear / pyramidal

Caffeine, a molecule found in coffee, tea, and certain soft drinks, contains C, H, O, and N. Combustion of 10.0 g of caffeine produces 18.13 g of CO2, 4.639 g of H₂O, and 2.885 g of N₂. Determine the molar mass of the compound if it is between 150 and 210 g/mol.

Which of the following bonds is the most polar? A) P-S B) C- CI C) F - F D) Rb - Br E) All bonds have equal polarity.

Calculate the effective nuclear charge on a valence electron in a sulfur atom.

Calculate the molar mass of an element which has 12 protons from the following list of elements, their number of protons and neutrons and their amount which has isotopes with the following Atomic Mass and abundance: (10 points) a. 22% of the element's isotopes have 12 protons and 11 neutrons b. 26% of the element's isotopes have 12 protons and 13 neutrons c. 34% of the element's isotopes have 14 protons and 12 neutrons d. 52% of the element's isotopes have 12 protons and 14 neutrons

Answer the following questions about the element Si and some of its compounds. (a) The mass spectrum of a pure sample of Si is shown below. (i) How many protons and how many neutrons are in the nucleus of an atom of the most abundant isotope of Si? (ii) Write the ground-state electron configuration of Si. Two compounds that contain Si are SiO2 and SiH4. (b) At 161 K, SiH4 boils but SiO₂ remains as a solid. Using principles of interparticle forces, explain the difference in boiling points.

Calculate the pH at 25 °C of a 0.57 M solution of lidocaine HC1 (C₁4H₂NONH₂C1). Note that lidocaine (C₁4H₂1NONH) Round your answer to 1 decimal place.

The treatment for iron-deficiency anemia can require an adult female to take a daily supplement of ferrous gluconate, C12H22FeO14, when her diet is not providing enough iron. What is the molar mass of ferrous gluconate (C12H22FeO14)? How many moles are in a supplement containing 37.0 mg C12H22FeO14?

1. Ceviche is a classic Peruvian dish containing fish. The first step in making ceviche is to marinate (soak) the fish in lime juice for four (4) hours until the fish is "cooked". What has happened to the fish to make it appeared cooked?

Identify whether each compound is covalent bond or ionic bond. a) Na2CO3 b) N20 c) KC2H302 [REMEMBER: IONIC BOND is metal and a non-metal AND COVALENT BOND is ALWAYS non-metal with a non- metal!!!] Think: Identify each element in the compound if each is metal then non-metal or non-metal then non-metal. Use the periodic table above or below. a) ionic b) covalent c) ionic a) covalent b) ionic c) ionic a) covalent b) ionic c) covalent a)ionic b) ionic c) covalent

Select the properties of an acidic bond. Select ALL that apply, meaning more than one answer may be correct. Low melting point. Polar covalent bond. H* (or H 30 *) ions are released in aqueous solutions. Conducts electricity in aqueous solutions.

What is the molarity of an aqueous solution that contains 0.0720 g C₂H6O₂ per gram of solution The density of the solution is 1.04 g/mL

Naturally occurring europium (Eu) consists of two isotopes was a mass of 151 and 153. Europium-151 has an abundance of 48.03% and Europium-153 has an abundance of 51.97%. What is the atomic mass of europium (show work)? What is the atomic mass of hafnium if, out of every 100 atoms, 5 have a mass of 176, 19 have a mass of 177, 27 have a mass of 178, 14 have a mass of 179, and 35 have a mass of 180.0 (show work)?

Determine the molecular and empirical formulas for the substance shown in the ball-and-stick model below.

Which of the following are true regarding effective nuclear charge? (Choose all that apply) Its magnitude is equal to the number of protons in the nucleus It is the difference between the atomic number and the number of shielding electrons It tends to increase for a valence electron as one goes to the right on the periodic table It represents the amount of positive charge from the nucleus felt by an electron It increases with number of neutrons in the nucleus

Water is the most common solvent in nature. The reason it is such a good solvent is due to the fact that it is able to form what kind of bonds/interactions? Polar covalent bonds van der Waals interaction Hydrogen bond Non-polar covalent bonds Electrostatic interactions

When NaCl is added to water, it dissolves because? CI+ ions are attracted to the 6 of the oxygen atom of water Nations are attracted to the 8* of the oxygen atom of water Nations are attracted to the 6 of the oxygen atom of water CI+ ions are attracted to the 6 of the hydrogen atom of water Na ions are attracted to the 8* of the oxygen atom of water

Write 'true' or 'false' for each statement. a. One mole of horses contains one mole of horse legs. b. A mole of water has a mass of 18.0 g. c. The mass of 1 molecule of water is 18.0 g. d. A mole of NaCl(s) contains 2 moles of ions.